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diff --git a/security/certverifier/tests/gtest/CTTestUtils.h b/security/certverifier/tests/gtest/CTTestUtils.h
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+++ b/security/certverifier/tests/gtest/CTTestUtils.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef CTTestUtils_h
+#define CTTestUtils_h
+
+#include <iostream>
+
+#include "pkix/Input.h"
+#include "pkix/Time.h"
+#include "seccomon.h"
+#include "SignedCertificateTimestamp.h"
+#include "SignedTreeHead.h"
+
+namespace mozilla { namespace ct {
+
+// Note: unless specified otherwise, all test data is taken from
+// Certificate Transparency test data repository at
+// https://github.com/google/certificate-transparency/tree/master/test/testdata
+
+// Fills |entry| with test data for an X.509 entry.
+void GetX509CertLogEntry(LogEntry& entry);
+
+// Returns a DER-encoded X509 cert. The SCT provided by
+// GetX509CertSCT is signed over this certificate.
+Buffer GetDEREncodedX509Cert();
+
+// Fills |entry| with test data for a Precertificate entry.
+void GetPrecertLogEntry(LogEntry& entry);
+
+// Returns the binary representation of a test DigitallySigned.
+Buffer GetTestDigitallySigned();
+
+// Returns the source data of the test DigitallySigned.
+Buffer GetTestDigitallySignedData();
+
+// Returns the binary representation of a test serialized SCT.
+Buffer GetTestSignedCertificateTimestamp();
+
+// Test log key.
+Buffer GetTestPublicKey();
+
+// ID of test log key.
+Buffer GetTestPublicKeyId();
+
+// SCT for the X509Certificate provided above.
+void GetX509CertSCT(SignedCertificateTimestamp& sct);
+
+// SCT for the Precertificate log entry provided above.
+void GetPrecertSCT(SignedCertificateTimestamp& sct);
+
+// Issuer key hash.
+Buffer GetDefaultIssuerKeyHash();
+
+// A sample, valid STH.
+void GetSampleSignedTreeHead(SignedTreeHead& sth);
+
+// The SHA256 root hash for the sample STH.
+Buffer GetSampleSTHSHA256RootHash();
+
+// The tree head signature for the sample STH.
+Buffer GetSampleSTHTreeHeadSignature();
+
+// The same signature as GetSampleSTHTreeHeadSignature, decoded.
+void GetSampleSTHTreeHeadDecodedSignature(DigitallySigned& signature);
+
+// Certificate with embedded SCT in an X509v3 extension.
+Buffer GetDEREncodedTestEmbeddedCert();
+
+// For the above certificate, the corresponsing TBSCertificate without
+// the embedded SCT extension.
+Buffer GetDEREncodedTestTbsCert();
+
+// As above, but signed with an intermediate CA certificate containing
+// the CT extended key usage OID 1.3.6.1.4.1.11129.2.4.4 for issuing precerts
+// (i.e. signed with a "precert CA certificate").
+Buffer GetDEREncodedTestEmbeddedWithPreCACert();
+
+// The issuer of the above certificates (self-signed root CA certificate).
+Buffer GetDEREncodedCACert();
+
+// An intermediate CA certificate issued by the above CA.
+Buffer GetDEREncodedIntermediateCert();
+
+// Certificate with embedded SCT signed by the intermediate certificate above.
+Buffer GetDEREncodedTestEmbeddedWithIntermediateCert();
+
+// As above, but signed by the precert CA certificate.
+Buffer GetDEREncodedTestEmbeddedWithIntermediatePreCACert();
+
+// Given a DER-encoded certificate, returns its SubjectPublicKeyInfo.
+Buffer ExtractCertSPKI(pkix::Input cert);
+Buffer ExtractCertSPKI(const Buffer& cert);
+
+// Extracts a SignedCertificateTimestampList from the provided leaf certificate
+// (kept in X.509v3 extension with OID 1.3.6.1.4.1.11129.2.4.2).
+void ExtractEmbeddedSCTList(pkix::Input cert, Buffer& result);
+void ExtractEmbeddedSCTList(const Buffer& cert, Buffer& result);
+
+// Extracts a SignedCertificateTimestampList that has been embedded within
+// an OCSP response as an extension with the OID 1.3.6.1.4.1.11129.2.4.5.
+// The OCSP response is verified, and the verification must succeed for the
+// extension to be extracted.
+void ExtractSCTListFromOCSPResponse(pkix::Input cert,
+                                    pkix::Input issuerSPKI,
+                                    pkix::Input encodedResponse,
+                                    pkix::Time time,
+                                    Buffer& result);
+
+// We need this in tests code since mozilla::Vector only allows move assignment.
+Buffer cloneBuffer(const Buffer& buffer);
+
+// Returns Input for the data stored in the buffer, failing assertion on error.
+pkix::Input InputForBuffer(const Buffer& buffer);
+
+// Returns Input for the data stored in the item, failing assertion on error.
+pkix::Input InputForSECItem(const SECItem& item);
+
+} } // namespace mozilla::ct
+
+
+namespace mozilla {
+
+// GTest needs this to be in Buffer's namespace (i.e. in mozilla::Vector's).
+std::ostream& operator<<(std::ostream& stream, const ct::Buffer& buf);
+
+} // namespace mozilla
+
+#endif  // CTTestUtils_h